Hans,
the wording in the operation manual can be misleading.
On pages 33-34: "For callsigns such as mine, consisting of 5 characters, I must enter a space character as the first
character in order to satisfy these callsign rules. "
As far as I understand:
Since 6 characters can be entered, the 6th character should be "space" for 5-character callsigns.
--
Gyula HA3HZ
HA3HZ